Methods of and apparatus for detecting openings in cable jackets

Details Methods of and apparatus for detecting openings in cable jackets Methods of and apparatus for detecting openings in cable jackets

1977-12-19

1979-08-14

Strecker, Gerard R.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Frequency of cyclic current or voltage

G01R 3114, G01R 3102

Patent

active

041647033

ABSTRACT:
An opening in a jacket (15) of a cable (16) is detected as the jacketed cable is moved from an extruder (14) through a probe (21) which is positioned in a cooling trough (17) and which comprises first and second aligned, spaced sensors (24, 26) with each of the sensors being connected to an arm of a bridge transformer (37). Electrical circuitry is designed to cause an unbalance voltage in a secondary (43) of the transformer (37) in response to conductance unbalance as the opening in the jacket (15) is advanced through the first sensor (24) and to cause an unbalance voltage of opposite polarity in the secondary (43) in response to conductance unbalance as the opening in thejacket (15) is advanced through the second sensor (26). Logic circuitry (66) tests the unbalance voltages for threshold and peak values to discern jacket holes despite the presence of extraneous signals such as those which are caused by noise.

REFERENCES:
patent: 3096478 (1963-07-01), Brown
patent: 3241061 (1966-03-01), Quittner
patent: 3277365 (1966-10-01), Doran
patent: 3781666 (1973-12-01), Dornberger

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